Inovance MD500T75G - General Precautions

Safety Information and Precautions MD500 User Manual
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General Precautions
1. Requirements of a residual current device (RCD)
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Thus install a type-B RCD at primary side of the power supply. When selecting the RCD, you should consider the transient and
steady-state leakage current to ground that may be generated at startup and during running of the AC drive. You can select a
specialized RCD with the function of suppressing high harmonics or a general-purpose RCD of 300 mA (
n
I
'
is two to four
times of protective conductor current).
2. Motor insulation test
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ƕ When the motor is reused after being stored for a long time
ƕ During regular maintenance checks.
This precaution detects poor insulation of the motor windings so that early actions can be taken to prevent damage to
the AC drive. The motor must be disconnected from the AC drive during the insulation test. A 500 volt insulation tester is
recommended for this test, and the insulation resistance must not be less than 5 M.
Figure 1 Connections required for a motor insulation test
U V W Motor input terminals
Insulation tester
Motor ground
3. Thermal protection of the motor
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operation panel of the AC drive or install a thermal relay in the motor circuit for protection. It is especially important to take
this precaution if the AC drive has a higher power rating than the motor.
4. Running at frequency higher than 50 Hz
The MD500 AC drive can output frequency in the range 0 to 500 Hz. If it is necessary to operate the MD500 AC drive at
frequency higher than 50 Hz, consider the capacity of the machine.
5. Vibration of the mechanical device
The AC drive might experience mechanical resonance at some output frequencies. It is possible to avoid this by selecting the
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6. Motor heat and noise
The output from the MD380 AC Drive is a pulse width modulation (PWM) waveform, which contains harmonic frequencies.
Because of this, the motor temperature, noise and vibration increase slightly when the AC drive operates at the line frequency
(50 Hz).
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